The National Weather Service issued Severe Thunderstorm Watch 562, effective until 8 p.m. EDT on July 31, 2025, covering Southern Maryland, the District of Columbia, parts of Virginia, and one West Virginia county. Southern Maryland severe weather concerns include Calvert, Charles, and St. Mary’s counties, alongside 11 other Maryland counties such as Anne Arundel, Howard, and Prince George’s. The watch also spans 21 Virginia counties, including Arlington, Fairfax, and Stafford, and Jefferson County in West Virginia’s panhandle. Cities like Annapolis, Lexington Park, Waldorf, and Prince Frederick are included, with potential for damaging winds, lightning, and heavy rainfall.
A concurrent Flood Watch, issued at 12:25 p.m. EDT on July 31 and lasting until 2 a.m. EDT on August 1, warns of possible flash flooding across Southern Maryland and surrounding areas. The National Weather Service forecasts numerous showers and thunderstorms, with rainfall rates of 1 to 2 inches in just 30 minutes. Widespread rainfall of 1 to 2 inches is expected, but some areas may see 4 to 6 inches if hit by multiple storms, heightening the risk of flash flooding in rivers, creeks, and urban areas. The heaviest rainfall is likely between 3 p.m. and 8 p.m., aligning with peak Southern Maryland severe weather threats.
In Southern Maryland, low-lying areas like Chesapeake Beach, Huntingtown, and St. Charles are particularly vulnerable to flooding due to poor drainage. Excessive runoff could inundate streams and streets, especially in urban zones like Waldorf and Lexington Park. The National Weather Service advises residents to monitor local conditions and avoid flood-prone roads. Southern Maryland severe weather preparedness is critical, as flash flooding can develop rapidly, threatening property and safety.
The thunderstorm watch signals potential for strong winds and lightning, which could disrupt power and damage structures in Calvert, Charles, and St. Mary’s counties. Residents in Annapolis and Columbia, also under the watch, should secure outdoor items and stay alert for rapidly changing conditions. The combination of heavy rain and thunderstorms increases risks for Southern Maryland severe weather impacts, particularly in flood-prone communities along the Patuxent River and Chesapeake Bay.
Local emergency management officials urge residents to stay informed via weather alerts and avoid driving through flooded areas. With storms expected to intensify this afternoon, residents in Prince Frederick and Lusby should prepare for possible road closures and power outages. The National Weather Service emphasizes flood safety, noting that even shallow water can sweep vehicles off roads.
Southern Maryland severe weather risks extend into the evening, with the flood watch highlighting potential for significant runoff. Residents should clear storm drains near their properties and avoid walking or driving through moving water. As the region braces for storms, staying updated through local news and weather apps is essential for safety in Calvert, Charles, and St. Mary’s counties.
